This has been around in the automotive field for yeas. That how you measure the size of bearing you need on an engine rebuild. The wax is a predetermined size and when you press it you measure the width of the compressed line to determine the # of thousands you need to make the bearings oversize.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †